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Liquid crystal display device and method of manufacturing the same

a technology of liquid crystal display and liquid crystal molecules, which is applied in static indicating devices, instruments, non-linear optics, etc., can solve the problems of static electricity breakdown and rubbing treatment of tft, and achieve the effect of suppressing the phenomenon of discoloration and increasing the tilt angle of liquid crystal molecules

Active Publication Date: 2005-07-28
AU OPTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0022] An object of the present invention is to provide a liquid crystal display device wherein it is possible to suppress the phenomenon (discolor) in which tone representation and color representation change depending on whether a screen is viewed from the front thereof or from an oblique direction and wherein it is possible to further improve display performance, and to provide a method of manufacturing the same.

Problems solved by technology

However, rubbing treatment has problems such as the occurrence of dust and the breakdown of a TFT due to static electricity.
However, the inventors of the present application consider that the above-described conventional art has the following problem.

Method used

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  • Liquid crystal display device and method of manufacturing the same
  • Liquid crystal display device and method of manufacturing the same
  • Liquid crystal display device and method of manufacturing the same

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

(1) First Embodiment

[0078]FIG. 3 is a plan view showing a picture element part of a liquid crystal display device (MVA type liquid crystal display device) of a first embodiment of the present invention. FIG. 4 is a schematic cross-sectional view showing part of a picture element of the same.

[0079] As shown in these FIGS. 3 and 4, the liquid crystal display device of the present embodiment includes a liquid crystal panel 140, which includes two glass substrates 110 and 120 and a liquid crystal layer 130 made of vertical alignment liquid crystal (liquid crystal with negative dielectric anisotropy) filling the space between the glass substrates 110 and 120, and two polarizing plates 141a and 141b placed in a manner such that the liquid crystal panel 140 is interposed therebetween.

[0080] On the glass substrate 110 (on the surface thereof which is opposed to the liquid crystal layer 130), a plurality of gate bus lines 111 horizontally extending and a plurality of data bus lines 113 ver...

second embodiment

(2) Second Embodiment

[0126]FIG. 11 is a plan view showing a picture element part of a liquid crystal display device of a second embodiment of the present invention. Incidentally, the present embodiment is different from the first embodiment in that the shapes of openings provided in a polyimide film for adjusting thresholds of T-V characteristics are different therefrom. Other components are basically the same as those of the first embodiment. Accordingly, in FIG. 11, the same components as those shown in FIG. 3 are denoted by the same reference numerals and will not be further described.

[0127] In the liquid crystal display device of the present embodiment, openings of a polyimide film 171 for threshold adjustment are randomly placed. T-V characteristic is changed by the influence of the liquid crystal alignment regulation power of TFT and opposing substrates. In the case where design has been performed in a manner such that areas having different T-V characteristics are placed at ...

third embodiment

(3) Third Embodiment

[0130]FIG. 12 is a plan view showing a picture element part of a liquid crystal display device of a third embodiment of the present invention. Incidentally, the present embodiment is different from the first embodiment in that the forming position of a polyimide film for adjusting thresholds of T-V characteristics is different therefrom. Other constituents are basically the same as those of the first embodiment. Accordingly, in FIG. 12, the same components as those shown in FIG. 3 are denoted by the same reference numerals and will not be further described.

[0131] In the present embodiment, a polyimide film 172 for adjusting thresholds of T-V characteristics is selectively formed in portions having domain regulation structures, i.e., protrusions 124 and slits 116a. In the areas having the structures, it is originally hard to apply a voltage to liquid crystal molecules, and therefore thresholds of T-V characteristics are higher than those in the areas having no st...

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PUM

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Abstract

A polyimide film is formed in only the peripheries of picture elements defined by gate bus lines and data bus lines. The areas where the polyimide film is formed have higher thresholds of transmittance-voltage (T-V) characteristics than the areas without polyimide films. Discolor can be suppressed by providing a plurality of areas having different T-V characteristics within each picture element as described above.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application is based on and claims priority of Japanese Patent Application No. 2004-014397 filed on Jan. 22, 2004, the entire contents of which are incorporated herein by reference. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to a liquid crystal display device suppressing a phenomenon in which tone representation and color representation change depending on whether a screen is viewed from the front thereof or from an oblique direction, and relates to a method of manufacturing the same. [0004] 2. Description of the Prior Art [0005]FIG. 1 is a plan view showing a picture element part of a conventional multi-domain vertical alignment (MVA) type liquid crystal display device, and FIG. 2 is a schematic cross-sectional view showing part of a picture element of the same (Japanese Patent Publication No. 2947350, Laid-open Japanese Unexamined Patent Publication No. 2002-107730, and the l...

Claims

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Application Information

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IPC IPC(8): G02F1/1333G02F1/13G02F1/1337G02F1/1339G02F1/1341G02F1/1343G02F1/139
CPCG02F1/133707G02F1/1393G02F1/133753G02F1/1337G02F1/1339
Inventor SASAKI, TAKAHIROUEDA, KAZUYATOYOOKA, YUKIKOHIROSAWA, JINTSUDA, HIDEAKI
Owner AU OPTRONICS CORP